Question

how many significant figures are in the following number: * 4,000
1
2
3
4
using the correct amount of precession, add the following: * 82.4 + 11.25
93.65
3.7

Explanation:

1. For the number of significant - figures in 4,000:

Step1: Apply significant - figure rules

Non - zero digits are always significant. Trailing zeros in a whole number without a decimal point may or may not be significant. In the number 4,000, without additional context, we assume the zeros are just placeholders. So, only the 4 is significant.

Step1: Align decimal points

When adding decimal numbers, we align the decimal points. So we have:

$$\begin{align*} 82.40\\ +11.25\\ \end{align*}$$

Step2: Add the numbers

Add the corresponding digits column - by - column:

$$\begin{align*} 82.40\\ +11.25\\ \hline 93.65 \end{align*}$$

Answer:

A. 1

2. For adding 82.4+11.25: